[bitcoin-dev] Electrum Server Speed Test

Joseph Gleason ⑈ fireduck at gmail.com
Thu Jul 23 17:18:59 UTC 2015

I have concerns about the performance of the Electrum server software as
well.  It seems to load data one block at a time (which normally makes
sense) and I think it is even single threaded on transactions inside the

To try to addresses these issues, I made my own implementation of the
electrum server.  It doesn't support UTXO (yet) but happily interacts with
all the clients I've tested.  It is heavily multithreaded, uses mongodb as
a key value store and bitcoinj for block and transaction parsing.


You can hit a running instance at:

A synced node uses 347G of mongodb storage.

Here are the recent blocks imported, with number of transactions and import
These times are based on having mongodb on SSD.
The CPU is 8 core Intel(R) Xeon(R) CPU E5430  @ 2.66GHz

I'd be happy to help with anything you need to evaluate it.

On Thu, Jul 23, 2015 at 9:01 AM Slurms MacKenzie via bitcoin-dev <
bitcoin-dev at lists.linuxfoundation.org> wrote:

> Similar to the Bitcoin Node Speed Test, this is a quick quantitative look
> at how the Electrum server software handles under load. The Electrum wallet
> is extremely popular, and the distributed servers which power it are all
> hosted by volunteers without budget. The server requires a fully indexed
> Bitcoin Core daemon running, and produces sizable external index in order
> to allow SPV clients to quickly retrieve their history.
>     3.9G    electrum/utxo
>     67M     electrum/undo
>     19G     electrum/hist
>     1.4G    electrum/addr
>     24G     electrum/
> Based on my own logs produced by the electrum-server console, it takes
> this server (Xeon, lots of memory, 7200 RPM RAID) approximately 3.7 minutes
> per megabyte of block to process into the index. This seems to hold true
> through the 10 or so blocks I have in my scroll buffer, the contents of
> blocks seem to be of approximately the same processing load. Continuing
> this trend with the current inter-block time of 9.8 minutes, an
> electrum-server instance running on modest-high end dedicated server is
> able to support up to 2.64 MB block sizes before permanently falling behind
> the chain.
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> bitcoin-dev at lists.linuxfoundation.org
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